Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
  • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
  • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
  • B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
  • A61F13/00—Bandages or dressings; Absorbent pads
  • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
  • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
  • A61F13/511—Topsheet, i.e. the permeable cover or layer facing the skin
  • A61F13/5116—Topsheet, i.e. the permeable cover or layer facing the skin being formed of multiple layers
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
  • A61F13/00—Bandages or dressings; Absorbent pads
  • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
  • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
  • A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
  • A61F13/537—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer
  • A61F13/53743—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer characterised by the position of the layer relative to the other layers
  • A61F13/53747—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer characterised by the position of the layer relative to the other layers the layer is facing the topsheet
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B23/00—Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose
  • B32B23/02—Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose in the form of fibres or filaments
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B23/00—Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose
  • B32B23/10—Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose next to a fibrous or filamentary layer
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/02—Layered products comprising a layer of synthetic resin in the form of fibres or filaments
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
  • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
  • B32B5/022—Non-woven fabric
• • B—PERFORMING OPERATIONS; TRANSPORTING
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  • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
  • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
  • B32B5/06—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer characterised by a fibrous or filamentary layer mechanically connected, e.g. by needling to another layer, e.g. of fibres, of paper
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
  • B32B7/04—Interconnection of layers
  • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
• • D—TEXTILES; PAPER
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  • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
  • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
  • D04H1/4326—Condensation or reaction polymers
  • D04H1/435—Polyesters
• • D—TEXTILES; PAPER
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  • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
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• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
  • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
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• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
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  • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
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• • D—TEXTILES; PAPER
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  • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
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  • D04H1/58—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives
  • D04H1/593—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties by applying, incorporating or activating chemical or thermoplastic bonding agents, e.g. adhesives to layered webs
• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
  • D04H13/00—Other non-woven fabrics
• • B—PERFORMING OPERATIONS; TRANSPORTING
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• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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  • Y10T156/1062—Prior to assembly
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• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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  • Y10T442/666—Mechanically interengaged by needling or impingement of fluid [e.g., gas or liquid stream, etc.]
  • Y10T442/667—Needled
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
  • Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
  • Y10T442/659—Including an additional nonwoven fabric
  • Y10T442/671—Multiple nonwoven fabric layers composed of the same polymeric strand or fiber material
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
  • Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
  • Y10T442/682—Needled nonwoven fabric
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
  • Y10T442/60—Nonwoven fabric [i.e., nonwoven strand or fiber material]
  • Y10T442/69—Autogenously bonded nonwoven fabric

Definitions

• the invention relates, in general, to a new nonwoven material, which when used as a veil or surface sheet or in addition to the surface veil as a strip in the crotch area in an article absorbent hygiene material, such as a diaper or incontinence pad, allows better isolation of the wearer's skin from the absorbent portion of the hygiene article.
• this new material promotes the time of piercing by body fluids, resistance to rewetting, and does not fluff.
• absorbent hygiene articles such as diapers and incontinence pads
• absorbent hygiene articles include an outer layer of liquid impermeable material, a cushion of absorbent material, and a body fluid permeable web or sheet , such as urine, of similar size and shape to that of the impermeable outer layer of the article.
• This veil of surface permeable to bodily fluids aims to isolate the skin from the moistened absorbent cushion. Therefore, the surface veil must have a suitable degree of softness and provide a desired insulation between the skin and the absorbent pad.
• the absorbent cushion has the function of absorbing fluids and therefore must have a high absorption speed as well as a large absorption capacity.
• a particularly effective absorbent cushion is described in document EP-A-0 232729.
• This absorbent cushion or mattress consists of a sheet of long absorbent fibers lined on its faces with a layer of cellulose wadding.
• the tablecloth doubled by the layers of wadding is needled from both sides.
• absorbent hygiene articles such absorbent mattresses or cushions are covered by a surface veil or by a band in the crotch area, generally made of non-woven material, which is intended to isolate the skin from the absorbent cushion and which must ensure pleasant contact with the skin and the desired insulation with the absorbent cushion.
• These veils or surface sheets and stripes of area between legs must have as essential properties a pleasant contact with the skin, a speed of crossing by the bodily fluids, a good resistance to rewetting and not to fluff.
• Document FR-A-2 588 285 describes a multi-layer nonwoven fabric having at least two layers of nonwoven web, one of the layers being formed of fibers of bilobed cross section and the other layer being formed of fibers of three-lobed cross-section.
• Each layer of veil is preferably obtained by the spun bonded technique and the two layers of veil are combined to form the multilayer nonwoven by thermal bonding in compacted and discontinuous zones.
• Document WO 87/07117 describes an absorbent hygiene article comprising an absorbent body surrounded by an envelope.
• This envelope or surface veil consists of two layers of nonwoven material.
• the first layer of nonwoven material in contact with the skin of the user, consists of a thin layer of fibrous tissue bonded to the spinning in a hydrophobic material, and the second layer in contact with the absorbent body is a layer hydrophobic fibrous tissue of fused fibers, similar in construction to the first layer.
• These two layers of surface veil are not linked together in the zone intended to come into contact with the body of the user.
• WO 88/05269 relates to a surface veil for a disposable absorbent article composed of at least two layers of nonwoven material which may be the same or different and which are joined by lines of adhesive forming an open pattern.
• a new composite nonwoven material has also recently been developed comprising at least a first layer consisting of a nonwoven (preferably linked to spinning) and, on this first layer, a sheet of carded type fibers, the sheet of carded type fibers being bonded to the base layer by needling.
• Another recently developed composite nonwoven material comprises a first layer of nonwoven (preferably spunbond), a web of carded type fibers and a second layer of a nonwoven (preferably linked to spinning) with a grammage lower than the first layer of nonwoven, the web of carded type fibers being disposed between the first and second layer of nonwoven. and the assembly being linked by needling.
• These materials have excellent crossing times for body fluids and excellent resistance to rewetting.
• these materials have a pronounced tendency to fluff when used as a surface veil or crotch band in absorbent hygiene articles, such as diapers.
• the present invention therefore aims to provide a composite nonwoven material which, when used as a surface veil or crotch strip in an absorbent hygienic article, has an excellent speed of crossing by fluids body, good resistance to rewetting and does not fluff.
• the invention also aims to provide a method of manufacturing such a composite nonwoven material.
• the present invention finally aims to provide an absorbent hygiene article comprising a surface veil or a crotch zone strip formed of such a composite nonwoven material.
• a composite nonwoven material is produced, characterized in that it comprises a sheet of carded type fibers permeable to bodily fluids, comprising at least a first layer of carded type fibers and a second layer of fibers. carded type, the fibers of the first layer having a denier higher than the fibers of the second layer, the two layers being joined together by needling.
• At least one of the layers of carded type fibers comprises fibers chosen from fibers with low melting point, bi-component fibers, and fibers mixed with a binder such as a hot-reactivable adhesive or a powder with a low melting point, and the fibers of the layers are also bonded together by thermofusion.
• the composite material further comprises first and second layers of carded type fibers, a third layer in a conventional nonwoven, permeable to fluids, for example of the type linked to spinning (spun) or linked by fusion, of low grammage, linked to one of the layers of carded type, by example the layer of carded type fibers of lower denier.
• the invention also provides a method of manufacturing a composite nonwoven material comprising the steps of: feeding a card, in the width direction, with first fibers and second fibers, the first fibers having a higher denier to the second fibers, to form adjacent or juxtaposed strips of carded type fibers of the first and second fibers; supplying the adjacent strips of carded type fibers to a spreader-lapper device for crossing the strips and forming a sheet consisting of the superimposed strips of the first and second fibers; supplying this sheet to a sheet stretching device for stretching the fibers of the strips and orienting them in the direction of travel while increasing the vertical orientation rate of said fibers in order to obtain, at the outlet of the sheet stretching device, a sheet fibers comprising a first layer of the first fibers and a second layer of the second fibers; and subjecting the sheet formed to a needling from at least one of its faces.
• At least one of the layers of the sheet comprises fibers chosen from fibers with a low melting point, bi-component fibers, and fibers mixed with a binder such as an adhesive.
• hot reactivable or a low melting point powder and the method further comprises bonding the fibers of the layers together by thermofusion, for example by reactivation by means of hot air passing through the web.
• the process of the present invention may, in addition, comprise an additional step consisting in bonding, for example by thermofusion, a third layer of a conventional nonwoven, of low grammage, to one of the layers of carded type fibers, for example the lower denier fiber layer.
• an absorbent hygiene article such as a diaper which comprises a outer layer of material impermeable to body fluids, an absorbent cushion permeable to bodily fluids and on this absorbent cushion either a veil or surface sheet, or a surface veil and a band of crotch area, the surface veil , when used alone, consisting of the composite nonwoven material according to the invention and the crotch zone strip consisting of the composite nonwoven material according to the invention and the surface veil.
• the surface veil or the crotch band consisting of the composite material according to the invention, is arranged so that the first layer of carded type fibers of larger denier either in direct contact with the internal surface of the absorbent pad, and therefore the second layer of carded type fibers of lower denier, or the third layer of conventional nonwoven, either in direct contact with the skin of the user or contact with the external surface of the surface veil in the case where the article comprises a surface veil of conventional nonwoven fabric
• the invention provides an absorbent hygiene article such as a diaper, which comprises an outer layer of material impermeable to body fluids, an absorbent pad permeable to bodily fluids attached to the outer layer, the outer layer and the absorbent pad comprising opposite end portions enlarged joined by a narrower crotch area, a surface sheet, preferably hydrophobic, a crotch strip, permeable to body fluids, disposed between the cushion and the surface sheet and of similar width at the crotch zone of the cushion
• the surface sheet comprises a longitudinal longitudinal cut forming an opening, preferably of oblong shape, and an intermediate strip, in conventional nonwoven, of dimension similar to that of the strip of zone of legs is arranged directly on the crotch area strip, below the surface sheet.
• the crotch band is generally linked to the absorbent cushion by any suitable means, and in particular by bonding to the edge of the absorbent cushion.
• FIG. 1 a schematic sectional view of a composite nonwoven material according to the invention
• Figure 2 a top view, partially broken away, of an absorbent hygiene article such as a diaper having a crotch zone strip made of the composite nonwoven material according to the invention
• Figure 3 a sectional view taken along line ⁇ l-III of Figure 2.
• FIG. 1 there is shown schematically in section a composite nonwoven material 1 according to the invention.
• This material comprises a first layer 2 made up of carded type fibers and a second layer 3 also made up of carded type fibers.
• the fibers of the first layer 2 of carded type fibers have a higher denier than the fibers of the second layer 3 of carded type fibers.
• the fibers of the first layer 2 have a denier between 3 and 8 and the fibers of the second layer 3 have a denier between 1 and 3.
• the fibers of the first layer 2 of the type carded have a denier of 4.4 while the fibers of the second layer 3 of carded type have a denier of 1.7.
• Bi-component fibers are fibers comprising a core of a relatively high melting point polymer enveloped by another relatively low melting point polymer allowing fusion of the fiber surface with moderate heating, such as heating with hot air.
• Hot reactivatable adhesives are well known in the art, an example of such an adhesive is an aqueous solution of EVA or acrylic type.
• powders with low melting point which can be used in the present invention are well known in the art and are generally powders of polymers with low melting point, such as, for example a polyethylene powder.
• the layers of carded type fibers of the composite material of the invention can be made of fibers of the same nature or of different natures, having identical or different deniers, on the condition that the denier of the fibers of the first layer 2 is greater than the denier of fibers of the second layer 3.
• each of the layers is made up of a mixture of fibers which have little or no fuse, such as polyester fibers, with fibers of low melting point, such as polyolefin fibers, for example polyethylene fibers, or bicomponent fibers, or fibers mixed with a binder such as a hot-reactivable adhesive or powder with a low melting point.
• fibers of low melting point such as polyolefin fibers, for example polyethylene fibers, or bicomponent fibers
• fibers mixed with a binder such as a hot-reactivable adhesive or powder with a low melting point.
• the proportion of fibers with a low melting point or with two components or the amount of binder mixed with the fibers will be between 5 and 30% by weight relative to the total weight.
• Each of the layers can also consist of fibers identical in nature.
• the nature of the fibers can be identical or different from one layer to another.
• the two layers consist only of fibers which are not very or not fusible, such as polyester fibers, the layers in the final product are joined only by needling.
• the layers of carded type fibers 2, 3 can have the same or different grammage.
• the layers Preferably have a basis weight between 10 and 30 g / m 2 .
• the layers of carded type fibers 2 and 3 are joined together by needling.
• the needling has a density of between 10 and 100 needle strokes / cm 2 and is obtained from the two faces of the composite material. This needling not only ensures a good bond between the two layers of the composite material but also makes it possible to increase the vertical orientation of the fibers, thus promoting the time for the composite to pierce through the body fluids.
• the connection between the layers of carded type fibers can also be carried out by thermofusion, in addition to the previous needling.
• the layers are subjected to a needling before reactivation with hot air for the thermofusion of the fibers, because this needling by increasing the rate of orientation of the fibers according to the vertical improves the reactivation by the hot air passing through the fibers. and their fixation between them.
• the composite material according to the invention comprises, in addition to the first and second layers of carded type fibers, a third layer of conventional non-woven, permeable to fluids, of low grammage.
• This third additional nonwoven layer can be made of any nonwoven of conventional type, well known in the art, such as for example a nonwoven of the type linked to spinning (spun) or linked by fusion.
• the conventional nonwoven may be formed from natural or synthetic textile fibers, such as cellulose, viscose, polyester, polyethylene, polypropylene, nylon, or ethylene-propylene copolymers fibers.
• natural or synthetic textile fibers such as cellulose, viscose, polyester, polyethylene, polypropylene, nylon, or ethylene-propylene copolymers fibers.
• the nonwoven of the conventional type consists of a layer of fibers, coated on one of its faces with a hot-reactivable adhesive or consists of a mixture of fibers comprising fibers chosen from fibers with a low point of fusion, the fibers mixed with a binder such as a hot-reactivable adhesive or a powder with a low melting point.
• a binder such as a hot-reactivable adhesive or a powder with a low melting point.
• the conventional nonwoven is a blend
• the proportion of fibers with a low melting point or of fibers mixed with a binder is between 5 and 30% by weight relative to the total weight.
• this conventional nonwoven has a low grammage, generally between 10 and 20 g / m 2 , and preferably 15 g / m 2 .
• the conventional type nonwoven is bonded by thermofusion to the second layer of carded type fibers of lower denier, for example by passing the layers of the composite through a STORCK type laminating calender.
• a method of manufacturing the composite nonwoven material according to the invention consists in feeding a card in the widthwise direction with first fibers and second fibers, the first fibers having a denier greater than the second fibers, to form adjacent strips. or juxtaposed, then from this card to supply with the adjacent strips a machine for crossing the layers of card called spreader-lapper, for example a machine type 350 from the company ASSELIN, which aims to superimpose the strips.
• the superimposed bands are then supplied to a tablecloth stretching device, for example, a tablecloth stretching machine from the company ASSELIN which stretches the fibers to preferentially orient them in the direction of travel of the machine and increases the vertical orientation of the fibers, to obtaining a sheet formed by a first layer of the first fibers and a second layer of the second fibers.
• a tablecloth stretching device for example, a tablecloth stretching machine from the company ASSELIN which stretches the fibers to preferentially orient them in the direction of travel of the machine and increases the vertical orientation of the fibers, to obtaining a sheet formed by a first layer of the first fibers and a second layer of the second fibers.
• the tablecloth is then subjected to needling alone or to needling and reactivation by hot air through the fiber layers to bind the fibers together.
• the method of the invention may also include an additional step in which the web made up of two layers of carded type fibers is bonded to a third layer of a conventional nonwoven of low grammage, by thermofusion of this third conventional nonwoven layer with the second layer of carded type fibers of the web, that is to say the layer formed from the fibers of the lowest last.
• this thermofusion is carried out by passing the sheet of carded type fibers and the third layer of conventional nonwoven through a lamination calender, for example of the STORCK type.
• the orientation of the fibers in the carded type composite material of the invention promotes the transport of body fluids lengthwise and in the case of the manufacture of diapers with a surface veil or a zone band. between the legs placed lengthwise, made from this composite nonwoven material, advantageously allows a greater proportion of the absorbent mass of the cushion placed below to be used.
• a card is fed crosswise with fibers mainly comprising 4,4 denier polyester fibers and 1,7 denier polyester fibers.
• the fibers are in fact either constituted by a mixture of polyester fibers and two-component fibers comprising a polyester core and a shell of polyethylene, the proportion of bicomponent fibers being 5 to 30% by weight relative to the total weight or a mixture of polyester and polyethylene fibers of 4.4 and 1, 7 deniers, the proportion of fibers has polyethylene being from 5 to 30% by weight relative to the total weight.
• a type crosslapper device 350 of the ASSELIN Society for a web of carded type fibers formed of 'superimposed fiber webs 1, 7 denier fibers 4.4 money.
• a tablecloth drawing machine from the company ASSELIN is supplied with these superimposed bands to obtain a composite tablecloth formed by a first layer of fibers of 4.4 denier and a second layer of fibers of 1.7 denier.
• the ply of fibers is subjected to needling having a needling density of 20 strokes / cm 2 and then the ply of carded type fibers is made to pass through a flow of hot air in order to reactivate the two-component fibers.
• a carded type composite nonwoven material is obtained according to the present invention.
• This material has an excellent crossing time for liquids, good resistance to rewetting and does not fluff.
• a surface veil or in addition to a surface veil as a band of the crotch area, by placing the layer of 1.7 denier fibers inwards, that is to say in contact with the skin of the user or the external surface of the surface veil, and the layer of 4.4 denier fibers directly on the absorbent pad, an absorbent article according to the invention is obtained having a suitable softness due to the fineness of the fibers used for the inner layer.
• the composite nonwoven material obtained according to the invention also has sufficient mechanical characteristics to be wound and used on a processing machine.
• FIGS. 2 and 3 are shown, by way of example, an absorbent hygiene article, such as a diaper, comprising a crotch strip made of a nonwoven material of carded type according to the invention. 'invention.
• the diaper shown in Figures 2 and 3 includes in a manner known per se, a support sheet 10 impermeable to liquids, an absorbent pad 12, for example made of cellulose fluff paste, optionally with the incorporation of so-called superabsorbent polymeric materials, a crotch band 27, an intermediate band 29 of dimension similar to that of the crotch zone strip 27, disposed directly on this crotch zone strip, and generally consisting of a conventional nonwoven, and a surface sheet 13, by example a hydrophobic fleece veil.
• the two sheets 10 and 13 have the same dimensions and the same hourglass shape, that is to say a rectangular shape with two opposite lateral notches delimiting, in the direction of the length of the diaper, an area 15 of legs of reduced width between two end zones 16 and 17 of increased width.
• the absorbent cushion 12 disposed between the two sheets 10 and 13 also has an hourglass shape but of smaller dimension than the sheets 10 and 13 which are interconnected for example by gluing around the entire periphery of the cushion 12.
• adhesive fasteners 19 are fixed on the opposite lateral edges on the end zone 16 constituting the rear part of the diaper.
• the surface sheet 13 has at its central part a central longitudinal cut 25 to form an opening, preferably of oblong shape.
• the width of the opening is significantly less than the width of the cushion 12, preferably less than half the width of the cushion 12 in the crotch area.
• the surface sheet 13 has, over its entire length, two double Z folds 30 downwards (towards the cushion 12) arranged on either side of the opening 25, and elastic elements 26 are fixed. in the stretched state by gluing in the upper folds of these double folds 30, both folds of each double fold 30 being secured to one another by gluing or any other means so as to consolidate or stiffen the cover sheet 13 at this location and thus facilitate cutting with removal of material from the opening 25, practiced later.
• the crotch strip 27 of composite nonwoven material according to the invention is disposed directly above the absorbent pad over the entire length of the diaper and has a width at least equal to the width of the absorbent pad 12 in the crotch area.
• the crotch zone strip 27 is linked to the absorbent pad 12 and / or to the intermediate strip 29 by any suitable well-known means, and the intermediate strip 29, in the embodiment shown, is fixed to the surface sheet 13 , on the one hand on the two transverse edges of the diaper and on the other grazes along two longitudinal lines 28, for example gluing lines, located in a position slightly offset from the longitudinal edges of the absorbent pad 12 in the crotch area 15.
• the surface sheet has been shown to have two double Z-folds 30, it is also possible to modify the shape of these folds in any suitable manner, for example by making folds having the shape of an S.
• the elastic elements 26 can be arranged in any suitable place other than the upper folds, for example the lower folds.
• the crotch strip 27 is constituted by a composite nonwoven material according to the invention comprising two layers of fibers of carded type of different denier joined together by needling, the layer of fibers of carded type of denier being the highest. direct contact with the absorbent pad 12.
• This diaper has a high speed of crossing by liquids, good resistance to rewetting and does not lint.

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• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Health & Medical Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• General Health & Medical Sciences (AREA)
• Veterinary Medicine (AREA)
• Epidemiology (AREA)
• Biomedical Technology (AREA)
• Heart & Thoracic Surgery (AREA)
• Vascular Medicine (AREA)
• Public Health (AREA)
• Animal Behavior & Ethology (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Absorbent Articles And Supports Therefor (AREA)
• Nonwoven Fabrics (AREA)
• Orthopedics, Nursing, And Contraception (AREA)
• Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
• Chemical Or Physical Treatment Of Fibers (AREA)
• Laminated Bodies (AREA)

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Applications Claiming Priority (2)

Related Child Applications (1)

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Citations (6)

Family Cites Families (32)

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  • 1993-05-26 FR FR9306327A patent/FR2705697B1/fr not_active Expired - Fee Related
• 1994
  • 1994-05-19 GB GB9410047A patent/GB2278371B/en not_active Expired - Fee Related
  • 1994-05-23 ZA ZA943556A patent/ZA943556B/xx unknown
  • 1994-05-24 SK SK1463-95A patent/SK283890B6/sk unknown
  • 1994-05-24 PL PL94311743A patent/PL173690B1/pl not_active IP Right Cessation
  • 1994-05-24 NZ NZ266818A patent/NZ266818A/en unknown
  • 1994-05-24 HU HU9503342A patent/HU219967B/hu not_active IP Right Cessation
  • 1994-05-24 DK DK94917047.6T patent/DK0704000T3/da active
  • 1994-05-24 WO PCT/FR1994/000607 patent/WO1994028222A1/fr active IP Right Grant
  • 1994-05-24 JP JP7500307A patent/JPH08510509A/ja active Pending
  • 1994-05-24 DE DE69402420T patent/DE69402420T2/de not_active Expired - Fee Related
  • 1994-05-24 US US08/553,299 patent/US5820615A/en not_active Expired - Fee Related
  • 1994-05-24 EP EP94917047A patent/EP0704000B1/fr not_active Expired - Lifetime
  • 1994-05-24 AT AT94917047T patent/ATE151126T1/de not_active IP Right Cessation
  • 1994-05-24 CZ CZ953107A patent/CZ284980B6/cs not_active IP Right Cessation
  • 1994-05-24 CA CA002163654A patent/CA2163654A1/fr not_active Abandoned
  • 1994-05-24 AU AU68498/94A patent/AU674961B2/en not_active Ceased
  • 1994-05-24 CZ CZ961977A patent/CZ284462B6/cs not_active IP Right Cessation
  • 1994-05-24 ES ES94917047T patent/ES2102862T3/es not_active Expired - Lifetime
  • 1994-05-25 TN TNTNSN94052A patent/TNSN94052A1/fr unknown
• 1995
  • 1995-11-24 FI FI955668A patent/FI955668A/fi not_active IP Right Cessation
  • 1995-11-24 NO NO954779A patent/NO304078B1/no unknown
• 1997
  • 1997-04-03 GR GR970400564T patent/GR3023024T3/el unknown
  • 1997-12-19 US US08/994,931 patent/US6452062B1/en not_active Expired - Fee Related

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